139.6% is the change from 250 to 599
Calculation steps:
[( 599 - 250 ) ÷ 250] x 100 = 139.6%
Formula
Percentage change = [(599 - 250) / 250] x 100
Subtract the new number by the original number
599 - 250 = 349
349 ÷ 250 = 1.396
1.396 x 100 = 139.6%
Example